Method of finishing castings.



- "UNITED "STATES PATENT oFFIoii ALLIE RAY WELCH AND FRED STIMSON WELCH, 0F PONTIAC, MICHIGAJ.\T.

METHOD or rmrsnine cns'rmes.

Specification of Letters ratent.

Patented Apr. 1913.

To all whom it may concern:

Be it lmown'that we, ALLIE R. WELCH and FRED STIMsoN WELCH, citizens of'the United States, residing at Pontiac, county of Oakland, State of Michigan, have invented a certain new and useful Improvement in 'Methods for Finishing Castings,

and declare the follo'win to be a full, clear, and exact description 0 the same, such as will enable others skilled in the art to which it pertains to make and use the same, reference being had to the accompanying drawings, which form a part of this specification.

Our invention relates to a method of finishing castings.

In many forms of castings where cores 2, and 3, are respectively a plan view and across-section of the disk used in our process. Figs. 4, 5, and 6, represent stepsin our process of closing such holes. Figs-7,

in diameter and binding-- it firmlyuagainst the wall 'o f the enlargement-C of the hole.-

and 8, represent a modified way of performing our process.

A, A represents a portion of the casting. B indicates the hole left in said casting.

'We first bore out the outer end of the hole B' to a larger diameter,'-as represented at C,- leaving an annular shoulder orshelf D.

We then provide a disk E, which we preferto makeof brass, having a-circular shapeand of -the diameterof the enlarged portion ,0 of the-hole This disk is concaved, as indicated in. Fig. 'We place this disk. 'upon th'e shoulder D, as represented in Fig." --5,- and then by a blow ofa' :hammer, or otherwise, flatten the disk" down, as represented in Fig.1 6, thus expanding the same B thus eftectively' closing the hole. Ina

modified form, we place a fiat disk E}, which 4 we also make of bra'ss or other soft' metal,

the purpose described.

upon the shoulder 1). We then place'a series of steel balls, such as are'used for ballbeai'ings, within the en argement C of the hole B, and around the edge of the disk E as shown in Fig. 7. We then force'down,

upon these balls, a spindle G, of a drill press 1 for instance, the spindle'G having a convex end, as'indicated in Fig. 7. -The spindle G is then rotated, spinning andexpanding'the metal and grooving the same, as'indicated at 6, Fig. 8, thus expanding the disk E and binding it firmly in place against the wall of the enlargement G of the holeB, and closing the hole l. The process of closing holes in castings consisting in shaping the hole solas to permit a piece of suitable material to enter the outer end thereof and to prevent said piece from passing through the hole, and then 'expanding the piece to bind it in the hole.

2. The process of closing a hole in a casting, consisting inenlarging the outer' end of said hole so as to form a shoulder, placing .a piece of suitable material on said shoulder and expanding said piece by pressing the same against said shoulder.

3. The process of closinga ing, consisting in enlarging the outer end of said hole so as to form a shoulder, plac ing a'concave disk on said shoulder and flattening said disk to force it against the walls of said openingand bind it in .place. 4. The process of closing a hole in a casting, consisting in enlarging the. outer end ,of said hole so as to form a shoulder, placing a workable metal disk on said shoulder, placing a hard metal ball. on said disk near its periphery, 'and pressing said balldoWn wardagainst said disk and rolling the same around said disk, substantially as -and for In testimony-whereof, We signithisspeci ficatio'n in the presence oftwo witnesses.

' ALLIE RAY W'ELGH. 4 FRED STIMS QN Witnesses I FLORENCE L. MILWARD,. 'MARGUERITE Gmnmos.

hole in a east'-. 

